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Push and pull
\"Describes the forces of push and pull using everyday objects such as strollers and wagons. Includes experiments\"-- Provided by publisher.
Book
The science of forces
A look at the science behind force, friction, and the laws of motion and energy.
Book
Tactical Inclusion
The revolution in military recruitment advertising to people of color and women played an essential role in making the US military one of the most diverse institutions in the United States. Starting at the dawn of the all-volunteer era, Jeremiah Favara illuminates the challenges at the heart of military inclusion by analyzing recruitment ads published in three commercial magazines: Sports Illustrated, Cosmopolitan, and Ebony. Favara draws on Black feminism, critical race theory, and queer of color critique to reveal how the military and advertisers affected change by deploying a set of strategies and practices called tactical inclusion. As Favara shows, tactical inclusion used representations of servicemembers in the new military to connect with people susceptible to recruiting efforts and rendered these new audiences vulnerable to, valuable to, and subject to state violence.
Compelling and eye-opening, Tactical Inclusion combines original analysis with personal experience to chart advertising's role in building the all-volunteer military.
eBook
Energy
\"In this book, readers will learn how energy affects the movement of objects through the air, the warmth we feel on our skin when the sun shines, and many concepts in between\"--Provided by publisher.
Book
The history-dependent features of muscle force production: A challenge to the cross-bridge theory and their functional implications
The cross-bridge theory predicts that muscle force is determined by muscle length and the velocity of active muscle length changes. However, before the formulation of the cross-bridge theory, it had been observed that the isometric force at a given muscle length is enhanced or depressed depending on active muscle length changes before that given length is reached. These enhanced and depressed force states are termed residual force enhancement (rFE) and residual force depression (rFD), respectively, and together they are known as the history-dependent features of muscle force production. In this review, we introduce early attempts in explaining rFE and rFD before we discuss more recent research from the past 25 years which has contributed to a better understanding of the mechanisms underpinning rFE and rFD. Specifically, we discuss the increasing number of findings on rFE and rFD which challenge the cross-bridge theory and propose that the elastic element titin plays a role in explaining muscle history-dependence. Accordingly, new three-filament models of force production including titin seem to provide better insight into the mechanism of muscle contraction. Complementary to the mechanisms behind muscle history-dependence, we also show various implications for muscle history-dependence on in-vivo human muscle function such as during stretch–shortening cycles. We conclude that titin function needs to be better understood if a new three-filament muscle model which includes titin, is to be established. From an applied perspective, it remains to be elucidated how muscle history-dependence affects locomotion and motor control, and whether history-dependent features can be changed by training.
Journal Article
Experiments with forces
Read and Experiment is an engaging series that uses fun experiments to introduce children to analytical thinking, scientific concepts and experimental procedures. Through fun, carefully designed experiments, it encourages children to get hands-on with science, asking questions and seeking their own answers by following the illustrated step-by-step instructions. The title gets them familiar with the science of forces.
Book
Single-Cell Analysis of Contractile Forces in iPSC-Derived Cardiomyocytes: Paving the Way for Precision Medicine in Cardiovascular Disease
Induced pluripotent stem cell-derived cardiomyocytes (iPSC-CMs) hold enormous potential in cardiac disease modeling, drug screening, and regenerative medicine. Furthermore, patient-specific iPSC-CMS can be tested for personalized medicine. To provide a deeper understanding of the contractile force dynamics of iPSC-CMs, we employed Atomic Force Microscopy (AFM) as an advanced detection tool to distinguish the characteristics of force dynamics at a single cell level. We measured normal (vertical) and lateral (axial) force at different pacing frequencies. We found a significant correlation between normal and lateral force. We also observed a significant force–frequency relationship for both types of forces. This work represents the first demonstration of the correlation of normal and lateral force from individual iPSC-CMs. The identification of this correlation is relevant because it validates the comparison across systems and models that can only account for either normal or lateral force. These findings enhance our understanding of iPSC-CM properties, thereby paving the way for the development of therapeutic strategies in cardiovascular medicine.
Journal Article
Experiments with forces
Genuine scientists test their theories through experiments, using the results to uncover truly amazing discoveries. In this beneficial STEM-based book, readers are the scientists diving into experiments about forces such as gravity, friction, and magnetism. Theyll use easy-to-find materials such as balloons, erasers, and rulers to perform step-by-step experiments, learning more about forces at work in the world all around them. A summary of each carefully illustrated experiment reviews what the result conveys about the concept, while extra activities encourage more experimentation, an attribute of every great scientist.
Book
The School of Hard Knocks
This important new history of the development of a leadership corps of officers during World War I opens with a gripping narrative of the battlefield heroism of Cpl. Alvin York, juxtaposed with the death of Pvt. Charles Clement less than two kilometers away.
Clement had been a captain and an example of what a good officer should be in the years just before the beginning of the war. His subsequent failure as an officer and his redemption through death in combat embody the question that lies at the heart of this comprehensive and exhaustively researched book: What were the faults of US military policy regarding the training of officers during the Great War?
In The School of Hard Knocks, Richard S. Faulkner carefully considers the selection and training process for officers during the years prior to and throughout the First World War. He then moves into the replacement of those officers due to attrition, ultimately discussing the relationship between the leadership corps and the men they commanded.
Replete with primary documentary evidence including reports by the War Department during and subsequent to the war, letters from the officers detailing their concerns with the training methods, and communiqués from the leaders of the training facilities to the civilian leadership, The School of Hard Knocks makes a compelling case while presenting a clear, highly readable, no-nonsense account of the shortfalls in officer training that contributed to the high death toll suffered by the American Expeditionary Forces in World War I.
eBook